What is CRS (Cell-specific reference signal)?

Cell-specific reference signals (CRS) are transmitted by adjoining cells across the whole frequency band. CRS interference becomes the restricting factor in accomplishing higher downlink throughput, without PDSCH from adjoining cells. In this manner, interference cancellation from CRS becomes a significant signal processing problem in LTE/LTE A frameworks. CRS interference is removed by utilizing channel gauges relating to adjoining cells, in conventional receivers, which are obtained from the received signal.